Interactions of Foundation Pit on the Underlying Adjacent Existing Underground Structures

Table 2

Calculation parameters of bolt.

Bolt diameter	Sectional area	Mortar diameter	Mortar perimeter	Bolt tensile strength	Bolt prestress
22 mm	3.50 cm^2	100 mm	0.314 m	250 kN	60 kN
Bolt length	Mortar cohesion	Mortar friction	Mortar stiffness	Bolt number	Adjacent bolts angle
3 m	20 kPa	25°	22.33 MN/m^2	21	9°